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# -*- coding: utf-8 -*-
#
# Copyright (C) 2006 Ali Sabil <ali.sabil@gmail.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#
"""Some missing weak refs"""
from weakref import WeakKeyDictionary
from sets import Set
__all__ = ['WeakSet']
class WeakSet(Set):
def __init__(self, iterable=None):
Set.__init__(self)
self._data = WeakKeyDictionary()
if iterable is not None:
self._update(iterable)
def __hash__(self):
raise TypeError, "Can't hash a WeakSet."
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